It is best to avoid powerheads if possible -- at least ones with strong jets pointed at corals.
Mine get indirect (but strong) flow under halides & T5 actinics.
Watch them though, they can grow over your other corals if left unchecked.
I am deliberately growing mine from one piece of LR (totally covered) to another large piece. But with enough space so that they cannot grow onto other rocks.
Mind you, I can see some frags of it growing on other un-designated rocks. They just appeared from nowhere, I must have fragged it when moving LR around.
Regards
Conor.